I bet you could. Honestly, if your computer has a webcam, all you need to do is install skype. If it doesn't, then buy one. Hook it up to the computer (they are USB, just like anything else you plug into your computer these days) and odds are it is plug-and-play, meaning you have to install nothing to get it working, and then you just download skype. It is incredibly easy.
Facetime is the Apple branding of skype. You can use it on certain iPhones and iPads and Macs.